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Unified Medical Language System® (UMLS®)

RxNorm Release Notes

April Release - 04/02/2012

This release of RxNorm is consistent with the 2011AB UMLS Metathesaurus release. For additional information about RxNorm releases, including scripts for loading the RxNorm data into Oracle and MySQL databases, read the RxNorm technical documentation.


The following sources have been updated since the previous RxNorm release:

Source NameSABDate Updated
Gold Standard Drug Database GS 03/06/2012
Medi-Span Master Drug Data Base MDDB 03/07/2012
Multum MediSource Lexicon MMSL 03/01/2012
Micromedex RED BOOK MMX 03/05/2012
FDA Structured Product Labels MTHSPL 03/23/2012
FDB MedKnowledge (formerly NDDF Plus) NDDF 03/07/2012
Veterans Health Administration National Drug File - Reference Terminology NDFRT 04/02/2012
Veterans Health Administration National Drug File VANDF 02/27/2012


The following sources have not been updated since the previous RxNorm release:

Source NameSABDate Updated
Medical Subject Headings (MeSH) MSH 09/09/2011
FDA National Drug Code Directory MTHFDA 06/01/2011
SNOMED Clinical Terms (drug information) SNOMEDCT 01/31/2012


Data Changes

There are no significant data changes for this release.

Data Counts

Term Type or AttributeNumber
Active GPCK forms 321
Active BPCK forms 404
Active SCD forms 20,702
Active SBD forms 17,114
Active RXNORM MIN atoms 3,737
Active RXNORM IN atoms 5,018
Active RXNORM PIN atoms 1,570
Active RXNORM BN atoms 15,735
Active RXNORM DF atoms 102
Obsolete GPCK forms 72
Obsolete BPCK forms 41
Obsolete SCD forms 13,014
Obsolete SBD forms 3,828
Obsolete RXNORM MIN atoms 0
Obsolete RXNORM IN atoms 0
Obsolete RXNORM PIN atoms 0
Obsolete RXNORM BN atoms 0
Obsolete RXNORM DF atoms 53
OCD atoms 296,600
Source-asserted NDC codes 1,058,495
Distinct Source-asserted NDC codes 497,989
SAB=RXNORM NDC codes 261,297
Distinct SAB=RXNORM NDC codes 261,297

Last Reviewed: April 23, 2012